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Old 03-08-2012, 05:54 PM   #1
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engine light, very desperate

For the past month i have been fighting a light that refuses to disappear. I Keep getting a p0135 and p0155.

Heres what ive done:

Changed 3 02 sensors ive gotten a code for all of them but continue to get a code for 2 brand new ones. I replaced them with bosch sensors.

Replaced the negative battery terminal connector. It was cracked and thought it might be causing a ground issue

Changed all of the fuel injectors thinking it was a fuel/air ratio problem.

Couple days ago i took it to a mechanic who checked every wire connection and cleaned up some oxydation at the processor, he tested it 3 times and the computer said it was working fine. I just turned the jeep on and the same codes are back.

I am very desperate to make this damned light go away. Please any advice, ideas, thoughts, anything!

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Old 03-08-2012, 06:36 PM   #2
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Quote:
Originally Posted by old_blue View Post
For the past month i have been fighting a light that refuses to disappear. I Keep getting a p0135 and p0155.

Heres what ive done:

Changed 3 02 sensors ive gotten a code for all of them but continue to get a code for 2 brand new ones. I replaced them with bosch sensors.

Replaced the negative battery terminal connector. It was cracked and thought it might be causing a ground issue

Changed all of the fuel injectors thinking it was a fuel/air ratio problem.

Couple days ago i took it to a mechanic who checked every wire connection and cleaned up some oxydation at the processor, he tested it 3 times and the computer said it was working fine. I just turned the jeep on and the same codes are back.

I am very desperate to make this damned light go away. Please any advice, ideas, thoughts, anything!
There is your problem right there. Jeeps and Bosch don't play well together. The factory NTK/NGK work well.

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Old 03-08-2012, 06:41 PM   #3
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Basic causes:
O2 Heater element resistance is high
Internal short or open in the heater element
O2 heater circuit wiring high resistance
open or short to ground in the wiring harness


OBD-II Trouble Code: P0135 Oxygen O2 Sensor Heater Circuit Malfunction (Bank1, Sensor1) The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.

OBD-II Trouble Code: P0155 Oxygen O2 Sensor Heater Circuit Malfunction (Bank2, Sensor1) The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0155.

But since it's setting both, I'd look at that coolant temp.

X2 Bosch is junk.
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Old 03-08-2012, 06:44 PM   #4
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The problem is not the temp sensor more than likely, the issue with Bosch O2 sensors is that they take to long to warm up in Jeeps which is why it trips this code.
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Old 03-08-2012, 06:56 PM   #5
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I guess thats my next move to replace the bosch sensors. I also switched the relay to the o2 sensors to eliminate that.

Just to get as many ideas as possible. If replacing the bosch sensors doesn't work, could the problem be with the ecu? In which case would it be better to replace it or flash it?
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Old 03-09-2012, 07:59 AM   #6
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It's the Bosch sensors. I've used Bosch in other vehicles without issue but when I put them in the Jeep, they tripped 135, 155 heater codes just like you. It's not a critical problem. I left them for over a year until I got tired of the light on.
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Old 03-09-2012, 09:21 AM   #7
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Quote:
Originally Posted by Neil F. View Post
It's the Bosch sensors. I've used Bosch in other vehicles without issue but when I put them in the Jeep, they tripped 135, 155 heater codes just like you. It's not a critical problem. I left them for over a year until I got tired of the light on.
Its critical for me, my inspection is 2 months past due and my extension is about up
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Old 03-11-2012, 05:57 PM   #8
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I have the same issue with my wife's Jeep, P0155 & P0135 codes. I replaced the old O2 sensors with Bosch and still was getting the codes. I was finally able to change out the Bosch O2's this morning with NGK's. I hope this fixes the code issues. I would get NKG's and don't mess with Bosch anymore.
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Old 03-11-2012, 08:21 PM   #9
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Fersure get the NKG sensors! That was the FIRST thing I learned off this forum. it FINALLY fixed those same codes...Autozone was sick of seeing me every few days swapping for another crappy bosch sensor.

I got mine at NAPA
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Old 03-11-2012, 08:49 PM   #10
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Switched the o2 sensors, lights gone and jeep passed inspection with flying colors! Thanks for your help guys
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Old 03-11-2012, 10:43 PM   #11
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Score!!

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